<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        html,body{
            margin: 0;
            padding: 0;
        }
    </style>
    <meta charset="UTF-8">
    <title>rain</title>
</head>
<body>
<canvas id="canvas"></canvas>
</body>
<script src="index.js"></script>
</html>